Dtjstproof ventilator



lMarch 14, 193.9. H, FRANKLIN DusTPRooF VENTILATOR Filed Aug. 17, 1936 l Illilllllllilllllllflllll/ INVENTOR 3 l l Ylllfllllllllllvllllllll 4 Patented Mar. 14, 1939 y UNiTl-:D STATESv PATENT OFFICE 4 Claims.

(c1. 12s-19s) (Granted under the act of March' s, 1883, as

amended April 30, 1928; 370 O. G. 757) My invention relates to air cleaning ventilators and more particularly to this type ventilator for preventing foreign matter, carried by the air, from entering the interior of engines,

. vyet one which will allow proper ventilation for carrying oi superfluous vapors and gases.

Many overhead valve engines at present are equipped with a rocker arm enclosure to prevent dust and other foreign matter from coming E in contact with the rocker arms, and later passing into the cylinders and crank case. The enclosure, however, must be ventilated to allow the escape of unburned gases, and the like. 'I'his is usually done by the provision of several louvers l in the top of the enclosure, opening toward the rear of the engine. In windy, sandy, and dusty territory, however, foreign matter carried by the air enters the louver openings and does great injury to the working parts of the engine.

go It is the main object of my invention to provide a ventilator which may be used either as an attachment for uengines of present design, or which may be made a part of the engine at 4the time of manufacture, and which wili prevent- With these and other objects in view as will.

more fully appear hereinbelow, my invention consists in the construction, novel features, and combination of parts hereinafter moreiully described, pointed out in the claims hereto ap-y pended, and illustrated in the accompanying one-sheet drawings, 0f which,

Figure 1 is a side sectional view of two of my ventilators installed on a valve enclosure, only a. portion of the'enclosure being shown;

4,3 Fig. 2 is a front view of the device, looking into its open end, installed on a valve enclosure shown` in section, the section being taken along the line 2-2 of Fig. 1; and,

Fig. 3 is a perspective'view of the device installed on a valve enclosure, the latter being only fragmentarily shown.

Like characters of reference designate like parts in all the gures.

' It is understood that various changes in the 5p form, proportion, size, shape, weight, material and other details of construction, within the scope of my invention may be .resorted to without departing from the spirit or broad principle of my invention and without sacricing any oi' the advantages thereof; and it is also understood 5 that the drawing is to be interpreted as being illustrative and not restrictive.

It is hereby understood and agreed that the invention described herein, if patented, may be manufactured andwused by or for the Govern- 10 ment for governmental purposes without payment to me of any royalty thereon.

The inventive ideainvolved is capable of receiving a variety of mechanical expressions one of which, v-for the purpose of illustrating the in- 15 vention, is'shown in the accompanying drawing.

Numeral l designates a rocker arm enclosure,

but as stated above it is understood that mydevice may be installed on any enclosure which is to be ventilated. Numeral 2 designates one type 20 opening over which my device may be placed. The device itself, designated as a whole by liu- 'merall is suitably fastened preferably by welding, to the outer wall of the enclosure over the outlet 2. The air outlet 4 'is preferably posi- 25 tioned va. distance from the outlet 2 'and faces opposite the direction in which the vehicle normally travels. The. outlet 4 is considerably larger than the opposite closed end 5. The wall tapers from the outlet 4 tothe end 5, and an in- 30 tegral flange 6 is provided to facilitate fastening the device securely to an enclosure.

Arial within the interior, a cotter key 9 is then eign matter from the air.

With the ltering material 8 in position it will 50 be readily seen that outside air passing over the device from the .end 5 toward the outlet 4 will cause a partial vacuum, and cause waste gas, vapor, and the like, to/be drawn from the interior o i' 'the enclosure through the outlet 2, through b5 the filtering material 8, and out through the outlet 4. AAny dust laden air which may enter the enclosure through the outlet 2 must first pass through the lter 8, which of course removes the foreign particles from the air before it actually does enter the enclosure.

Obviously. the invention is susceptible of embodiment in forms 4other than that which is illustrated in the accompanying drawing and described herein, and applicable for uses and purposes other than as detailed, and I therefore consider as my own all such modifications and adaptations and other uses of the form of the device herein described as fairly fall within the scope of my invention.

Having thus described my invention, what is claimed and desired to be secured by Letters Patent, is: l. A ventilator construction for an opening comprising a hood structure rigidly secured to a wall surrounding said opening, said structure having its open rear end arcuately curved, and being tapered fromsaid open end toward said `wall and terminating in a closed end adjacent the wall; a lter housed in said open end over said opening composed 4ofsuitable brous oil bearing material, and holding means through oppositely disposed perforations in the walls of said .structure for retaining said lter material in position. l

2. In combination with an engine having an Youtlet perforation through which it is desired to ventilate the engine. a device of the class described comprising a taperedhood portion open only at oneend, having its main body portion rigidly secured and sealed against the portion of said engine immediately adjacent said outlet, and having its open end opening in a direction opposite to the normal direction of travel of the engine, whereby air passing said opening causes a suction from the interior of said engine through the outlet and through said hooded portion; and a mass of fibrous material substantially loosely filling 4said hooded portion so as to shut-olf any direct communication between the interior of said engine and the outside atmosphere.

- 3. In a ventilator construction for an engine, a metallic hood structure rigidly secured to a wall vover an opening therein, said structure having an arcuately curved open rear end and tapering.

from saidopen end toward said wall, and terminating in a closed end adjacent the wall; a filter housed in said hood structure and over sail wall opening composed of an oil laden iibrous material; and a pin passing through oppositely disposed perforations in the walls of said hood gine, whereby air passing said 'opening causes a suction from the interior of said engine through the outlet and through said-hoodedportion; a mass of fibrous material substantially loosely lling said hooded portion so as to shut off any di.

rect communication between the interior of said engine and the outside atmosphere, and a pin passing through oppositely disposed perforations in the walls of said hood structure adjacent its open end for retaining said iilter in position within said hood structure and over said wall opening. -IV

H ARRISON FRANKLIN. f 

